黄骅坳陷中生界内幕不整合构造的时空差异及其构造地质意义  

Temporal and Spatial Evolution of the Mesozoic Unconformity Structure in Huanghua Depression and its Tectonic Geological Significance

作　　者：张津宁 周建生[1] 王建柱[1] 付立新[1] 李宏军[1] 楼达[1] 王辉[1] 吴佳朋 ZHANG Jinning;ZHOU Jiansheng;WANG Jianzhu;FU Lixin;LI Hongjun;LOU Da;WANG Hui;WU Jiapeng(PetroChina Dagang Oilfield Company,Tianjin 300280,China;China University of Petroleum(Beijing)at Karamay,Karamay 834000,Xinjiang,China)

机构地区：[1]中国石油大港油田,天津300280 [2]中国石油大学(北京)克拉玛依校区,新疆克拉玛依834000

出　　处：《大地构造与成矿学》2020年第5期831-844,共14页Geotectonica et Metallogenia

基　　金：中国石油天然气股份有限公司重大科技专项“大港油区效益增储稳产关键技术研究与应用”(2018E-11)资助。

摘　　要：中生代是中国东部沉积盆地形成与发育的关键期,不整合空间结构响应了中生代构造运动的类型、变形特点。本文以黄骅坳陷中生界内幕不整合为研究对象,解剖不整合接触层位、结构样式和空间分布,明确古构造格局,探讨盆地演化过程。结果表明:黄骅坳陷中生界内幕发育3套二级不整合面,中-下侏罗统与前侏罗系以平行不整合为主,下白垩统与前白垩系单斜不整合分布广泛,构造调节带发育褶皱不整合和断褶不整合,古近系与前古近系在凸起构造带发育单斜、断褶和褶皱不整合,凹陷区见平行不整合;侏罗系沉积前古构造为宽缓的褶皱构造,白垩系沉积前北区为剥蚀区,南区为陆相沉降区,古近系沉积前中-北区为陆相沉降区,南区为剥蚀区,形成反转盆地构造;黄骅坳陷中生代为3期沉降、3期抬升,构造调节带为盆地沉降反转的关键界限,区域构造体制的转变为不整合结构及构造变形差异化的根本动力来源。不整合空间结构属性客观地纪录了沉积盆地构造活动强度、古构造格局与发育过程,为构造运动在盆内重要体现。Mesozoic is a critical period for the formation and development of sedimentary basins in East China.The unconformity structure is a response of the Mesozoic deformations.To delineate the paleotectonic framework and evolution of the basin,we carried out a systematic investigation of the contact horizon,structural style and spatial distribution of the Mesozoic unconformities in the Huanghua Depression.The results showed that three sets of secondary unconformities developed in the Huanghua Depression during Mesozoic.The unconformities of the Jurassic-Pre-Jurassic and Cretaceous-Pre-Cretaceous are mainly parallel and monoclinic unconformities respectively.Fold unconformity and fault-fold unconformity are common in tectonic accommodation zones.The unconformities of Paleogene-Pre-Paleogene in the uplift structural belt are commonly monoclinic,fault fold and fold unconformities,while those in the depression area are commonly parallel unconformities.The paleostructure was likely a gentle fold structure in the Late Triassic.The northern part of the basin was denudation area,whereas the southern part was continental subsidence area in the Late Jurassic.However,the northern part turned into continental subsidence area while the southern part of the basin a denudation area in the Late Cretaceous.The Mesozoic tectonic evolution can be divided into three stages of subsidence and three stages of uplift.The depression basin experienced the Early Triassic subsidence,the Middle-Late Triassic uplift and denudation,the Early-Middle Jurassic differential subsidence,the Late Jurassic compression-torsion uplift and denudation,the Early Cretaceous differential subsidence,and the Late Cretaceous regional uplift and denudation.The tectonic accommodation zone was the key boundary of basinal subsidence and uplift.The unconformity structure recorded the intensity of tectonic activity,paleotectonic pattern,and development of the sedimentary basin.

关 键 词：不整合 中生代 黄骅坳陷 燕山运动 构造地质 接触关系 

分 类 号：P542.34[天文地球—构造地质学]